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105
som Piggene paa et sammenrullet Pindsvin (deraf
Arts-benævnelsen).
Integumenterne er særdeles haarde og faste, skjøndt
noget gjennemsigtige og uden nogen tydeligt udpræget
Skulptur eller Haarbesætuing.
Hovedet er noget nedtrykt og har Panderanden i
Midten temmelig stærkt udraiulet, saa at Sidehjornerne
træder frem som afrundede Lapper, der delvis dækker 2det
Par Føleres Basalled. Enhver af disse Lapper gaar nedad
ud i et skarpt tandformigt Fremspring. Oventil er
Hovedet forsynet med 8 tornformige Fortsatser, hvoraf de 2
staar over og noget foran Øinene, medens de øvrige 6
danner en buet Tværrad over den bagerste Del af Hovedet.
lste frie Forkropssegment har Sidedelene udviklede
paa en lignende Maade som hos de 2 foregaaende Arter
til skjævt fortilrettede Lapper. Det har en regelmæssig
Tværrad af 8 spidse Torner. Ethvert af de 2 følgende
Segmenter viser en fuldkommen lignende Bevæbning. 4de
Segment er betydelig baade længere og bredere end de
øvrige og har 2 Tværrader af spidse Torner. De 3
følgende Segmenter aftager hurtigt i Brede bagtil og har
hvert en enkelt Tværrad af Torner samt tilspidsede og til
Siderne stærkt udstaaende Epimerer.
Bagkroppen, der omtrent indtager ’/4 af
Totallængden, bestaar tilsyneladende kun af 2 Segmenter, idet det
2det er ufuldstændigt begrændset fra Endesegmentet, lste
Segment er meget lidet og har en Tværrad af Torner,
som dog her er mindre end paa Forkropssegmenterne.
Endepartiet, der altsaa ogsaa omfatter det hos de 2
foregaaende Arter tydeligt begrændsede 2det Segment, viser
til hver Side 2 stærke triangulære og noget
bagudkrum-mede Fortsatser og har oventil 4 parvis stillede, ligeledes
bagudkrummede Torner, hvorpaa følger en dobbelt Rad af
en Del noget mindre saadanne. Enden er ikke som hos
de 2 foregaaende Arter simpelt tilspidset, men viser i
Midten en tydelig Udrandning begrændset til liver Side af et
kort tandformigt Fremspring.
Øinene er meget smaa, cirkelrunde og udstaaende til
Siderne, med mørkt Pigment.
lste Par Følere (Fig. 25) er omtrent af Hovedets
Længde og viser en lignende Bygning som hos de 2
foregaaende Arter, dog med den Forskjel, at Svøben her er
meget smal, lineær og kun forsynet med 3 Sandsevedhæng
nær Spidsen.
2det Par Folere (se Fig. 23 og 24) er vistnok i
Forhold til lste Par kraftigt udviklede, men dog paa langt
nær ikke som hos de 2 foregaaende Arter, idet deres
Længde i fuldt udstrakt Tilstand er kjendelig mindre end
Totallængden. Basalafsnittet, som ogsaa her egentlig
dannes af 2 Led, er kort og tykt og gaar ved Enden paa den
Den norske Nordhavsexpedition, G. O. Sars: Crustacea.
everywhere armed, and that bristle out on all sides, like
the quills of a rolled-up -porcupine (hence the specific
designation).
The integuments are exceedingly hard and firm,
though somewhat translucent, and have no perceptibly
prominent sculpture or covering of hair.
The head is slightly depressed, with the frontal
margin considerably emarginate in the middle, causing the
lateral corners to protend as rounded lobes, that partly
cover the basal joint of the 2nd pair of antennæ. Each
of these lobes juts out below as an acutely dentiform
projection. Above, the head is furnished with 8 spiniform
projections, of which 2 are placed above and a little
anterior to the eyes, whereas the remaining 6 constitute an
arcuate transverse series, above the posterior part of the
head.
The 1st free segment has the lateral parts developed
in a manner precisely similar to those ill the preceding
species, viz. as oblique, anteriorly directed lobes. It has
a regular transverse series of 8 acute spines. Each of
the 2 succeeding segments exhibits a perfectly similar
armature. The 4th segment is a good deal longer and
broader than the others, and has 2 transverse series of
acute spines. The 3 succeeding segments diminish rapidly
in breadth posteriorly, and have each of them a single
transverse series of spines, together with pointed epimera.
projecting very considerably toward the sides.
The posterior division of the body, measuring about
one-fourth of the total length, consists apparently of but 2
segments, the 2nd segment being imperfectly separated
from the terminal one. The 1st segment is very small,
and has a transverse series of spines, which, however, are
smaller than those on the segments belonging to the
anterior division. The terminal portion, comprising also
accordingly the 2nd segment — distinctly defined in the 2
preceding species — exhibits on either side 2 strong triangular,
and somewhat posteriorly curving projections, and has,
above, 4 pairs of likewise posteriorly curving spines, to
which succeeds a double series of similar but smaller ones.
The extremity is not, as in the 2 preceding species, simple
pointed, but exhibits in the middle a distinct
emargina-tion, bounded on either side by a short dentiform
projection.
The eyes, laterally protruding, are very small,
circular in shape, and furnished with a dark pigment.
The 1st pair of antennæ (fig. 25) are about of the
same length as the head, and in structure similar to those
in flu’ 2 preceding species, saving, however, that the
flagellum is very slender, linear, and provided with only 3
sensory appendices, in close proximity to the point.
The 2nd pair of antennæ (figs. 23, 24) are, indeed,
as compared with the 1st pair, powerfully developed, by
no means, however, to the same extent as in the 2
preceding species, their length, when fully extended, being
perceptibly less than that of the body. The basal section,
which here, too, strictly, consists of 2 joints, is short and
14
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